Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/17317
標題: 同調光在光折變晶體中的光調制不穩定圖案演變
The Pattern Transition of Modulation Instability for a Coherent Beam in the Photorefractive Crystal
作者: 劉瀚元
Liu, Han-Yuan
關鍵字: 光調制不穩定性
MI
點群
被抑制
規則圖案
dot groups
be arrested
出版社: 奈米科學研究所
引用: [1] B. E. A. Saleh , M. C. Teich , Fundamentals of photonics (2007) , sec18 [2] Ming-Feng Shih,”photorefractive screening solitons ,their induced waveguides and interactions ” , Ph.D. diss. ,Princetion University,1998. [3] C. C. Jeng , Ph. D. diss , “Optical Modulation Instability and Vortex Solitons in Noninstantaneous Nonlinear Media” , National Taiwan University , 2004 [4] N. F. Pilipetskii and A. R. Rustamov , JETP Lett. 2 , 307 (1965) [5] V. I. Karpman , JETP Lett. 6 , 277 (1967) [6] K. Tai , A. Hasegawa , and A. Tomita , Phys. Rev. Lett. 56 , 135 (1986) [7] 石明豐 , 物理雙月刊 25卷 2期 (2003) [8] D. Kip, M. Soljacic, M. Segev, et al, Science 290, 495 (2000) [9] C. C. Jeng , et al , Phys. Rev. Lett. 102 , 153905 (2009) [10] M. F. Shih, C. C. Jeng, et al , Phys. Rev. Lett. 88 , 133902(2002) [11] G. P. Agrawal , et al , Phys. Rev. Lett. 59 , 880 (1987) [12] M. Segev , et al , Phys. Rev. Lett. 73 , 3211 (1994) [13] E. Hecht, Optics (2002) , sec4 [14] G. A. Agrawal, Nonlinear Fiber Optics, 3 ed.( 2001) [15] K. Motzek, et al, Optics Lett. 29, 280 (2004) [16] 賴柏霖 ,〝同調光在非立即反應非線性介質中的光調制不穩定性〞, 國立中興大學物理研究所碩士學位論文(2007) [17] 許智穎 ,〝在非立即反應非線性介質中的光條制不穩定性演變〞, 國立中興大學物理研究所碩士學位論文(2010) [18] 林昭吟 ,〝Study on the Optical Instabilities in the Self-focusing [18] Noninstantaneous Media〞, 國立台灣大學物理研究所碩士學位論文(2002) [19] 鄧雁卿 ,〝部份非同調光孤子的同調性研究〞, 國立台灣大學物理研究所碩士學位論文(2002)
摘要: 本實驗旨在探討與研究同調光在光折變晶體中的光調制不穩定行為與現象。透過電壓調控非線性強度以及光強度調控介質反應速率,我們探討調制不穩定圖案在條狀與點狀圖案之外的圖案變化,以及調制不穩定圖案與介質反應速率的關係。 我們發現當介質非線性強度逐漸增加時,調制不穩定圖案會從二維點狀演變成點群圖案。光點會分裂成更小的光點,細小光點會逐漸匯聚成群落,在空間中呈不均勻分布。非線性強度越大時,點群面積也隨之擴大。我們還發現調制不穩定圖案除了在低光強時會被抑制外,在高光強時也會被抑制,而背景光的強度比例與介質非線性強度會影響調制不穩定圖形在光強度的分佈範圍。最後,我們在特定光強度下,發現具有高規則度的調制不穩定圖案,當增加或減低光強時,圖案規則度會下降。
This experiment presents the research on optical modulation instability in the photorefractive nonlinear media. The material response time and the nonlinear strength are modulated by the intensity of light and the bias voltage. We discuss the properties of the new pattern of modulation instability and the relation between the material response time and the transition of patterns. We found that the pattern transits from two-dimensional filaments to dot groups with increasing the intensity of the material nonlinearity. The light dots in the pattern would split into smaller dots and converge to the groups. The area of dot groups would be expanded as increasing the bias voltage. The other finding is the pattern of modulation instability will be arrested not only in the low intensity but also in the high intensity. Finally, we found highly regular patterns in a particular light intensity and the pattern became irregular with increasing or decreasing of the intensity.
URI: http://hdl.handle.net/11455/17317
其他識別: U0005-2907201203191100
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2907201203191100
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